| 1 | /* Low-level parallel port routines for the ASUS WL-500g built-in port |
| 2 | * |
| 3 | * Author: Nuno Grilo <nuno.grilo@netcabo.pt> |
| 4 | * Based on parport_pc source |
| 5 | */ |
| 6 | |
| 7 | #include <linux/config.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/ioport.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/parport.h> |
| 14 | #include <linux/parport_pc.h> |
| 15 | |
| 16 | #define SPLINK_ADDRESS 0xBF800010 |
| 17 | |
| 18 | #undef DEBUG |
| 19 | |
| 20 | #ifdef DEBUG |
| 21 | #define DPRINTK printk |
| 22 | #else |
| 23 | #define DPRINTK(stuff...) |
| 24 | #endif |
| 25 | |
| 26 | |
| 27 | /* __parport_splink_frob_control differs from parport_splink_frob_control in that |
| 28 | * it doesn't do any extra masking. */ |
| 29 | static __inline__ unsigned char __parport_splink_frob_control (struct parport *p, |
| 30 | unsigned char mask, |
| 31 | unsigned char val) |
| 32 | { |
| 33 | struct parport_pc_private *priv = p->physport->private_data; |
| 34 | unsigned char *io = (unsigned char *) p->base; |
| 35 | unsigned char ctr = priv->ctr; |
| 36 | #ifdef DEBUG_PARPORT |
| 37 | printk (KERN_DEBUG |
| 38 | "__parport_splink_frob_control(%02x,%02x): %02x -> %02x\n", |
| 39 | mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); |
| 40 | #endif |
| 41 | ctr = (ctr & ~mask) ^ val; |
| 42 | ctr &= priv->ctr_writable; /* only write writable bits. */ |
| 43 | *(io+2) = ctr; |
| 44 | priv->ctr = ctr; /* Update soft copy */ |
| 45 | return ctr; |
| 46 | } |
| 47 | |
| 48 | |
| 49 | |
| 50 | static void parport_splink_data_forward (struct parport *p) |
| 51 | { |
| 52 | DPRINTK(KERN_DEBUG "parport_splink: parport_data_forward called\n"); |
| 53 | __parport_splink_frob_control (p, 0x20, 0); |
| 54 | } |
| 55 | |
| 56 | static void parport_splink_data_reverse (struct parport *p) |
| 57 | { |
| 58 | DPRINTK(KERN_DEBUG "parport_splink: parport_data_forward called\n"); |
| 59 | __parport_splink_frob_control (p, 0x20, 0x20); |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | static void parport_splink_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 64 | { |
| 65 | DPRINTK(KERN_DEBUG "parport_splink: IRQ handler called\n"); |
| 66 | parport_generic_irq(irq, (struct parport *) dev_id, regs); |
| 67 | } |
| 68 | */ |
| 69 | |
| 70 | static void parport_splink_enable_irq(struct parport *p) |
| 71 | { |
| 72 | DPRINTK(KERN_DEBUG "parport_splink: parport_splink_enable_irq called\n"); |
| 73 | __parport_splink_frob_control (p, 0x10, 0x10); |
| 74 | } |
| 75 | |
| 76 | static void parport_splink_disable_irq(struct parport *p) |
| 77 | { |
| 78 | DPRINTK(KERN_DEBUG "parport_splink: parport_splink_disable_irq called\n"); |
| 79 | __parport_splink_frob_control (p, 0x10, 0); |
| 80 | } |
| 81 | |
| 82 | static void parport_splink_init_state(struct pardevice *dev, struct parport_state *s) |
| 83 | { |
| 84 | DPRINTK(KERN_DEBUG "parport_splink: parport_splink_init_state called\n"); |
| 85 | s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); |
| 86 | if (dev->irq_func && |
| 87 | dev->port->irq != PARPORT_IRQ_NONE) |
| 88 | /* Set ackIntEn */ |
| 89 | s->u.pc.ctr |= 0x10; |
| 90 | } |
| 91 | |
| 92 | static void parport_splink_save_state(struct parport *p, struct parport_state *s) |
| 93 | { |
| 94 | const struct parport_pc_private *priv = p->physport->private_data; |
| 95 | DPRINTK(KERN_DEBUG "parport_splink: parport_splink_save_state called\n"); |
| 96 | s->u.pc.ctr = priv->ctr; |
| 97 | } |
| 98 | |
| 99 | static void parport_splink_restore_state(struct parport *p, struct parport_state *s) |
| 100 | { |
| 101 | struct parport_pc_private *priv = p->physport->private_data; |
| 102 | unsigned char *io = (unsigned char *) p->base; |
| 103 | unsigned char ctr = s->u.pc.ctr; |
| 104 | |
| 105 | DPRINTK(KERN_DEBUG "parport_splink: parport_splink_restore_state called\n"); |
| 106 | *(io+2) = ctr; |
| 107 | priv->ctr = ctr; |
| 108 | } |
| 109 | |
| 110 | static void parport_splink_setup_interrupt(void) { |
| 111 | return; |
| 112 | } |
| 113 | |
| 114 | static void parport_splink_write_data(struct parport *p, unsigned char d) { |
| 115 | DPRINTK(KERN_DEBUG "parport_splink: write data called\n"); |
| 116 | unsigned char *io = (unsigned char *) p->base; |
| 117 | *io = d; |
| 118 | } |
| 119 | |
| 120 | static unsigned char parport_splink_read_data(struct parport *p) { |
| 121 | DPRINTK(KERN_DEBUG "parport_splink: read data called\n"); |
| 122 | unsigned char *io = (unsigned char *) p->base; |
| 123 | return *io; |
| 124 | } |
| 125 | |
| 126 | static void parport_splink_write_control(struct parport *p, unsigned char d) |
| 127 | { |
| 128 | const unsigned char wm = (PARPORT_CONTROL_STROBE | |
| 129 | PARPORT_CONTROL_AUTOFD | |
| 130 | PARPORT_CONTROL_INIT | |
| 131 | PARPORT_CONTROL_SELECT); |
| 132 | |
| 133 | DPRINTK(KERN_DEBUG "parport_splink: write control called\n"); |
| 134 | /* Take this out when drivers have adapted to the newer interface. */ |
| 135 | if (d & 0x20) { |
| 136 | printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n", |
| 137 | p->name, p->cad->name); |
| 138 | parport_splink_data_reverse (p); |
| 139 | } |
| 140 | |
| 141 | __parport_splink_frob_control (p, wm, d & wm); |
| 142 | } |
| 143 | |
| 144 | static unsigned char parport_splink_read_control(struct parport *p) |
| 145 | { |
| 146 | const unsigned char wm = (PARPORT_CONTROL_STROBE | |
| 147 | PARPORT_CONTROL_AUTOFD | |
| 148 | PARPORT_CONTROL_INIT | |
| 149 | PARPORT_CONTROL_SELECT); |
| 150 | DPRINTK(KERN_DEBUG "parport_splink: read control called\n"); |
| 151 | const struct parport_pc_private *priv = p->physport->private_data; |
| 152 | return priv->ctr & wm; /* Use soft copy */ |
| 153 | } |
| 154 | |
| 155 | static unsigned char parport_splink_frob_control (struct parport *p, unsigned char mask, |
| 156 | unsigned char val) |
| 157 | { |
| 158 | const unsigned char wm = (PARPORT_CONTROL_STROBE | |
| 159 | PARPORT_CONTROL_AUTOFD | |
| 160 | PARPORT_CONTROL_INIT | |
| 161 | PARPORT_CONTROL_SELECT); |
| 162 | |
| 163 | DPRINTK(KERN_DEBUG "parport_splink: frob control called\n"); |
| 164 | /* Take this out when drivers have adapted to the newer interface. */ |
| 165 | if (mask & 0x20) { |
| 166 | printk (KERN_DEBUG "%s (%s): use data_%s for this!\n", |
| 167 | p->name, p->cad->name, |
| 168 | (val & 0x20) ? "reverse" : "forward"); |
| 169 | if (val & 0x20) |
| 170 | parport_splink_data_reverse (p); |
| 171 | else |
| 172 | parport_splink_data_forward (p); |
| 173 | } |
| 174 | |
| 175 | /* Restrict mask and val to control lines. */ |
| 176 | mask &= wm; |
| 177 | val &= wm; |
| 178 | |
| 179 | return __parport_splink_frob_control (p, mask, val); |
| 180 | } |
| 181 | |
| 182 | static unsigned char parport_splink_read_status(struct parport *p) |
| 183 | { |
| 184 | DPRINTK(KERN_DEBUG "parport_splink: read status called\n"); |
| 185 | unsigned char *io = (unsigned char *) p->base; |
| 186 | return *(io+1); |
| 187 | } |
| 188 | |
| 189 | static void parport_splink_inc_use_count(void) |
| 190 | { |
| 191 | #ifdef MODULE |
| 192 | MOD_INC_USE_COUNT; |
| 193 | #endif |
| 194 | } |
| 195 | |
| 196 | static void parport_splink_dec_use_count(void) |
| 197 | { |
| 198 | #ifdef MODULE |
| 199 | MOD_DEC_USE_COUNT; |
| 200 | #endif |
| 201 | } |
| 202 | |
| 203 | static struct parport_operations parport_splink_ops = |
| 204 | { |
| 205 | parport_splink_write_data, |
| 206 | parport_splink_read_data, |
| 207 | |
| 208 | parport_splink_write_control, |
| 209 | parport_splink_read_control, |
| 210 | parport_splink_frob_control, |
| 211 | |
| 212 | parport_splink_read_status, |
| 213 | |
| 214 | parport_splink_enable_irq, |
| 215 | parport_splink_disable_irq, |
| 216 | |
| 217 | parport_splink_data_forward, |
| 218 | parport_splink_data_reverse, |
| 219 | |
| 220 | parport_splink_init_state, |
| 221 | parport_splink_save_state, |
| 222 | parport_splink_restore_state, |
| 223 | |
| 224 | parport_splink_inc_use_count, |
| 225 | parport_splink_dec_use_count, |
| 226 | |
| 227 | parport_ieee1284_epp_write_data, |
| 228 | parport_ieee1284_epp_read_data, |
| 229 | parport_ieee1284_epp_write_addr, |
| 230 | parport_ieee1284_epp_read_addr, |
| 231 | |
| 232 | parport_ieee1284_ecp_write_data, |
| 233 | parport_ieee1284_ecp_read_data, |
| 234 | parport_ieee1284_ecp_write_addr, |
| 235 | |
| 236 | parport_ieee1284_write_compat, |
| 237 | parport_ieee1284_read_nibble, |
| 238 | parport_ieee1284_read_byte, |
| 239 | }; |
| 240 | |
| 241 | /* --- Initialisation code -------------------------------- */ |
| 242 | |
| 243 | static struct parport *parport_splink_probe_port (unsigned long int base) |
| 244 | { |
| 245 | struct parport_pc_private *priv; |
| 246 | struct parport_operations *ops; |
| 247 | struct parport *p; |
| 248 | |
| 249 | if (check_mem_region(base, 3)) { |
| 250 | printk (KERN_DEBUG "parport (0x%lx): iomem region not available\n", base); |
| 251 | return NULL; |
| 252 | } |
| 253 | priv = kmalloc (sizeof (struct parport_pc_private), GFP_KERNEL); |
| 254 | if (!priv) { |
| 255 | printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base); |
| 256 | return NULL; |
| 257 | } |
| 258 | ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL); |
| 259 | if (!ops) { |
| 260 | printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n", |
| 261 | base); |
| 262 | kfree (priv); |
| 263 | return NULL; |
| 264 | } |
| 265 | memcpy (ops, &parport_splink_ops, sizeof (struct parport_operations)); |
| 266 | priv->ctr = 0xc; |
| 267 | priv->ctr_writable = 0xff; |
| 268 | |
| 269 | if (!(p = parport_register_port(base, PARPORT_IRQ_NONE, |
| 270 | PARPORT_DMA_NONE, ops))) { |
| 271 | printk (KERN_DEBUG "parport (0x%lx): registration failed!\n", |
| 272 | base); |
| 273 | kfree (priv); |
| 274 | kfree (ops); |
| 275 | return NULL; |
| 276 | } |
| 277 | |
| 278 | p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT; |
| 279 | p->size = (p->modes & PARPORT_MODE_EPP)?8:3; |
| 280 | p->private_data = priv; |
| 281 | |
| 282 | parport_proc_register(p); |
| 283 | request_mem_region (p->base, 3, p->name); |
| 284 | |
| 285 | /* Done probing. Now put the port into a sensible start-up state. */ |
| 286 | parport_splink_write_data(p, 0); |
| 287 | parport_splink_data_forward (p); |
| 288 | |
| 289 | /* Now that we've told the sharing engine about the port, and |
| 290 | found out its characteristics, let the high-level drivers |
| 291 | know about it. */ |
| 292 | parport_announce_port (p); |
| 293 | |
| 294 | DPRINTK(KERN_DEBUG "parport (0x%lx): init ok!\n", |
| 295 | base); |
| 296 | return p; |
| 297 | } |
| 298 | |
| 299 | static void parport_splink_unregister_port(struct parport *p) { |
| 300 | struct parport_pc_private *priv = p->private_data; |
| 301 | struct parport_operations *ops = p->ops; |
| 302 | |
| 303 | if (p->irq != PARPORT_IRQ_NONE) |
| 304 | free_irq(p->irq, p); |
| 305 | release_mem_region(p->base, 3); |
| 306 | parport_proc_unregister(p); |
| 307 | kfree (priv); |
| 308 | parport_unregister_port(p); |
| 309 | kfree (ops); |
| 310 | } |
| 311 | |
| 312 | |
| 313 | int parport_splink_init(void) |
| 314 | { |
| 315 | int ret; |
| 316 | |
| 317 | DPRINTK(KERN_DEBUG "parport_splink init called\n"); |
| 318 | parport_splink_setup_interrupt(); |
| 319 | ret = !parport_splink_probe_port(SPLINK_ADDRESS); |
| 320 | |
| 321 | return ret; |
| 322 | } |
| 323 | |
| 324 | void parport_splink_cleanup(void) { |
| 325 | struct parport *p = parport_enumerate(), *tmp; |
| 326 | DPRINTK(KERN_DEBUG "parport_splink cleanup called\n"); |
| 327 | if (p->size) { |
| 328 | if (p->modes & PARPORT_MODE_PCSPP) { |
| 329 | while(p) { |
| 330 | tmp = p->next; |
| 331 | parport_splink_unregister_port(p); |
| 332 | p = tmp; |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | MODULE_AUTHOR("Nuno Grilo <nuno.grilo@netcabo.pt>"); |
| 339 | MODULE_DESCRIPTION("Parport Driver for ASUS WL-500g router builtin Port"); |
| 340 | MODULE_SUPPORTED_DEVICE("ASUS WL-500g builtin Parallel Port"); |
| 341 | MODULE_LICENSE("GPL"); |
| 342 | |
| 343 | module_init(parport_splink_init) |
| 344 | module_exit(parport_splink_cleanup) |
| 345 | |
| 346 | |
